Amazing things that I got used to when hiking in the swiss countryside: the small self service farm shops.
This one has two fridges with local dairy products (cheese, yoghurt, milk) and meat (pork and turkey).
You either pay by dropping cash in a box (and you can take the change from the cup...), Twint (P2P qr-code payment) or even credit card! (first time I see that)
@robryk yeah that's SumUp, a lot of small businesses use them. It's kind of the local Square terminal :)